Shaper for drill bits



Sept. 22, 1.925.

G. R. WATSON SHAPER FOR DRILL BITS Filed Sept. 1924 jh-uento GHK.Watson, y

,Azf rnay.

Patented Sept. 22, 1925.

UNITED stares GEQRGER- .w soN. or

PATENT OFFICE.

warnmiooflown, Assrenon TO ARMSTRONG MANUFACTUR- 11m COMPANY, onwA'rERLoo, IOWA.

snares, FOR DRILL Burs.

Application filed September 5,,1924- Serial K0 1133454.

T aZZrwlm m it may concern I Be i known ha 1., G RG E. WArsQN,. oitizenf th United,..,Stat s, re ding at Wa erlwl n th c unty-of .BlackhawkhndSte of Iowa, here n-vented ce ain new an usefu Imp ovem nt in She-pet'sDrill Bits, of which the follew-ing a specification.- i 4 y ntion. petains to di pers d s for forming by percussion the cutting ends f. dlTlllablt$ and theehiectt y p ment is to supply a device which mayusefully perform that purpose in the most efficient way to provide exactcutting edges and at the same time properly shape the reaming cuttersandthe crushing end face of the bit.

This object I have accomplished by the means which are hereinafterdescribed and claimed and illustrated in the accompanying drawings, inwhich Fig. lis' a side elevation of my improved shaper or die forforming a drill-bit working terminal, Fig. 2 is a top plan thereof, andFig. 3 a bottom plan thereof; and l Figs. 4 and 5 are respectively aside elevation and a plan of the cutting end face of a drill-bit such asis shaped in its end face parts by my said shaper.

The drill-bit referred to has the usual shank 14, elongated body 15 andopposite side longitudinal grooves 16, the grooves being shaped withtheir inner parts of circular cross section with the side openings ofless width than the diameter of the inner parts. The drill-head 17 iswidened to excavate the drill-hole in rock strata as for wells, and hason its end face a diametrical depending cutter 18, anticlinal and havinga medial notch 21 with whose opposite sides the open lower ends of thegrooves .16 communicate. The crushing end face of the bit is hollowedupwardly, preferably with two concentric annular planes or zones, eachflat, but the outer zone 19 inclined more steeply toward the arcuatereaming edges of the tool than the inner zone 20, the latter thussupporting .the reamers, while the acuteness of the latter addefiiciency in use and permit sharpening with a minimum removal ofmaterial. V

The shaping die for the end face and cutters of this bit has a shortshank 1 with axial socket 3 to receive a stem or hammerpart of anoscillating hammer of any desired type.

The shank hasa transverse threaded hole at 2 or w vea pin- The die has awidened body 4, relatively short. i The working end face of said shapingdie l asa flat face 12 at one side ofa diameter thereof, and bounded bysaid diameter a fiat inclined part or shoulder 13, relatively narrow.This is best shown in plan in Fig.

j,3, and the end faccat the opposite side of thisshoulderiS shaped withconcentric zones 10 and 11, the zones both inclined relative to the axisof the die, the outer zone 10 having the least inclination. I

Similar conical frustumsv 5 and 7 project from the flat end face 12 andfrom the two zone face parts '10, 11 respectively, opposite each other,and each frustum has on its outer side a projection as at 6 and 8 oftrapezoidal shape whose function will be described.

Connecting the frustums 5 and 7 in alinement is a part 9 which, as shownin Fig. 1,

is notched in a V-shape and has anticlinal side faces extending at oneside of the die to the sloping shoulder 13.

In using the die 4 to shape the cutting terminal of the bit 15, the bitis supported throughout its length on any suitable base or device topermitit to be steadily rocked to and fro manually on its longitudinalaxis while being prevented from shifting longitudinally underpercussion.

The die is attached to some apparatus which may place it in rapidreciprocation longitudinally in line with the bit 15 longitudinally andaxially so that a rapid percussion takes place against the bit end face.The frustums 5 and 7 together with their trapezoidal projections enterthe ends of the grooves 16 which have theretofore been made in thebitbody, and thus guide the bit in its operation upon said end face.

It will be understood that the percussion of the die upon the end faceof the bit rapidly shapes the latter into the form shown in the bitillustrated inFigs. i and 5.

WVhen the die has been used for a time, the sloping shoulder acts informing one anticlinal slope of the bit cutter 18. The bit is thenmanually rocked one-half way around, so that the die may act to shapethe other anticlinal face of said cutter. The reversing'of the bitduring this operation upon it, whereby the shoulder 13 ofthe die worksalternately to shape the slopes of the cutter 18, results in a drawingout of the cutter part gradually by impacts upon opposite faces whichdrawing out is in line with the fibers of the metal and shapes thecutter with an exact cutting angle, not possible when the metal of thecutter has to be forced into a notch, as the latter operation allows themetal to become misshapen and rounded where it should be edged.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is:

1. A shaping die for a drill-bit, having a sloping shoulder bounded by adiameter of its end face, and frustal guide projections upon said endface at opposite sides of said shoulder and connected by a ridge part.

2. A shaping die for a drill-bit, having a sloping shoulder bounded by adiameter of its end face along one side, the end face at the oppositeside being shaped with concentric differently inclined zones.

3. A shaping die for a drill-bit, having a sloping shoulder boundedalong one side by a diameter of its end face, the end face at theopposite side of the shoulder being shaped with concentric differentlyinclined zones, and guide projections on opposite parts of said endface.

4. A shaping die for a drill-bit, having a sloping shoulder across itsend face, the end face at one side of said shoulder being shaped withconcentric differently inclined zones, and frustal guide projections onsaid end face at opposite sides of said shoulder and having on theirouter sides trapezoidal guide projections.

In testimony whereof I aflix my signature.

WVaterloo, Iowa, Aug. 5, 1924.

GEORGE R. WATSON.

